36 



PHOTOCHEMICAL PRINCIPLES 



'•-c 



Yellow Pigments 



phycocyonin 



'"ure°c 



Chlorophyll 



" ,c 



F,r 12 The relative content of three pigments in Anacystis after 1 

 lid alter 2 days growth on a plate having crossed gradients of temperature 

 and light intensity (Halldal, 1958a). 



